EP1503521A1 - Dispositif de communication mobile - Google Patents

Dispositif de communication mobile Download PDF

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Publication number
EP1503521A1
EP1503521A1 EP03723182A EP03723182A EP1503521A1 EP 1503521 A1 EP1503521 A1 EP 1503521A1 EP 03723182 A EP03723182 A EP 03723182A EP 03723182 A EP03723182 A EP 03723182A EP 1503521 A1 EP1503521 A1 EP 1503521A1
Authority
EP
European Patent Office
Prior art keywords
reception
antenna
transmission
transmitting
antennas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03723182A
Other languages
German (de)
English (en)
Inventor
Makoto Mochizuki
Tadahisa Kamiya
Masato Shinomiya
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP1503521A1 publication Critical patent/EP1503521A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching

Definitions

  • the present invention relates to a mobile communication apparatus capable of simultaneously performing a transmitting operation and a receiving operation. Precisely speaking, the present invention is directed to a structure of an antenna switching unit for switching antennas between a transmission system and a reception system.
  • data communication operations can be carried out by utilizing packet communication systems in addition to voice telephone communications.
  • packet communication operations by utilizing wireless systems very recently, such packet communication operations capable of simultaneously performing both transmitting operations and receiving operations have been gradually employed, the data transfer rates of which are improved.
  • TDMA Time Division Multiple Access
  • asymmetrical packet communication operations have been proposed. That is, in such an asymmetrical packet communication operation, in a single sub-frame equal to 1 unit at which time division multiplexing access operation is carried out, while a plurality of slots used to transfer data along a down-stream direction, i.
  • the data transfer rate of the down-stream direction can be improved by such an asymmetrical packet communication operation.
  • an antenna commonly-operable device which includes filters on both the transmission side and the reception side in order to eliminate adverse influences which are mutually caused by both the transmission system and the reception system.
  • Fig. 4 is a block diagram for representing a structural example of a mobile communication apparatus operable in simultaneous transmitting/receiving operations.
  • This mobile communication apparatus is arranged by connecting an antenna commonly-operable device 102 to an antenna 101, while the antenna commonly-operable device 102 includes a transmission-side filter 103 and a reception-side filter 104.
  • a transmitting unit 105 is connected to the transmission-side filter 103 of the antenna commonly-operable device 102, whereas a receiving unit 106 is connected to the reception-side filter 104.
  • the antenna 101 is continuously connected to both the transmission system and the reception system, and both the transmitting operation and the receiving operation can be carried out at the same time.
  • a transmission signal supplied from the transmitting unit 105 is cut off by the reception-side filter 104 in order not to be inputted to the reception system, and also, a reception signal derived from the antenna 101 is cut off by the transmission-side filter 103 in order not to be inputted to the transmission system.
  • the reception diversity operation can be realized in a relatively easy manner.
  • it is difficult to perform a transmission diversity operation and also, when simultaneous transmitting/receiving operations are carried out, diversity operations can be hardly carried out in the transmission system and the reception system respectively.
  • the present invention has been made to solve the above-described problems, and has an object to provide a mobile communication apparatus capable of simultaneously performing both a transmitting operation and a receiving operation, by which a reception sensitivity when the simultaneous transmitting/receiving operations are carried out can be improved.
  • another object of the present invention is to provide a mobile communication apparatus capable of independently selecting one antenna from a plurality of antennas in both a transmitting operation and a receiving operation so as to improve either reception performance or reception performance by way of a diversity operation.
  • a mobile communication apparatus of the present invention is featured by such a mobile communication apparatus capable of simultaneously performing operations for transmission and reception, the mobile communication apparatus, comprising: a transmission system for processing a transmission signal; a reception system for processing a reception signal; a plurality of antennas for connecting the transmission system and the reception system; a switch which selectively connects the plurality of antennas with the transmission system and the reception system; and an antenna selector which operates, to connect the transmission system with any one of the plurality of antennas at timing when a transmitting operation is performed, to connect the reception system to any one of the plurality of antennas at timing when a receiving operation is performed, to connect both a transmission-side filter in the transmission system and a reception-side filter in the reception system with any one of the plurality of antennas so as to constitute an antenna commonly-operable device at timing when transmitting/receiving operations are simultaneously performed, or to connect both the transmission system and the reception system with separate antennas among the plurality of antennas.
  • the antenna commonly-operable device can be constituted by both the transmission-side filter and the reception-side filter.
  • the above-described antenna selector is featured by that the antenna selector performs a connection control operation for connecting the plurality of antennas with the transmission system and the reception system by using a transmission timing signal indicative of the timing for performing the transmitting operation and a reception timing signal indicative of the timing for performing the receiving operation as control signals.
  • connection switching operation for connecting the antenna to both the transmission system and the reception system is performed by employing both the transmission timing signal and the reception timing signal, any one of the transmission system and the reception system can be firmly cut off from the antenna when the simultaneous transmitting/receiving operations are not carried out, so that the loss can be reduced and the reception sensitivity can be improved.
  • the above-explained switch is featured by that the antenna selector independently performs a diversity operation during at least one of the transmitting operation and the receiving operation by using a transmission antenna switching signal indicative of the antenna selection when the transmitting operation is performed and a reception antenna switching signal indicative of the antenna selection when the receiving operation is performed as control signals.
  • the selection switching operation of the antennas is carried out by employing both the transmission antenna switching signal and the reception antenna switching signal, even when the transmitting operation and the receiving operation are carried out at the same time, one antenna can be separately selected from the plural antennas in the transmitting operation and the receiving operation, so that both the transmission diversity operation and the reception diversity operation can be carried out. As a consequence, either the reception performance or the transmission performance by the diversity operation can be improved.
  • reference numeral 11 shows an antenna "A”
  • reference numeral 12 indicates an antenna “B”
  • reference numeral 13 represents an antenna selector
  • reference numeral 14 denotes a transmission-side filter
  • reference numeral 15 shows a reception-side filter
  • reference numeral 16 indicates a transmitting unit
  • reference numeral 17 represents a receiving unit
  • reference numeral 19 denotes a switching control unit
  • reference numeral 21 represents a switch "A”
  • reference numeral 22 indicates a switch "B”
  • reference numeral 23 denotes a switch "C”
  • reference numeral 24 is a switch "B”
  • reference numeral 31 shows a transmission timing signal
  • reference numeral 32 indicates a reception timing signal
  • reference numeral 33 indicates a transmission antenna switching signal
  • reference numeral 34 shows a reception antenna switching signal.
  • Fig. 1 is a block diagram showing an arrangement of a major unit of a mobile communication apparatus according to an embodiment of the present invention.
  • a structure of a connecting unit for connecting both transmitting/receiving units and an antenna of a portable telephone is shown which is employed in a mobile station terminal of a mobile communication system.
  • the mobile communication apparatus of this embodiment corresponds to a voice conversation operation, a packet communication operation, and the like in the TDMA (Time Division Multiple Access) system.
  • the mobile communication apparatus is arranged by that simultaneous transmitting/receiving operations can be carried out in the case of the packet communication operation, and the like.
  • the mobile communication apparatus of this embodiment includes both a first antenna "A" 11, and a second antenna “B” 12, which transmit and receive wireless signals, and are connected to an antenna selecting device 13.
  • the antenna selector 13 switches connections between these antennas 11 and 12.
  • Both a transmission-side filter 14 and a reception-side filter 15, which constitute an antenna commonly-operable device, are connected to the antenna selector 13.
  • the transmission-side filter 14 cuts off reception signals received by the antennas 11 and 12 in such a manner that the reception signals do not flow into a transmission system.
  • a transmitting unit 16 for performing a modulating operation, an amplifying operation, and the like of transmission signals is connected to this transmission-side filter 14.
  • the reception-side filter 15 cuts off transmission signals which are outputted from the transmitting unit 16 to the antennas 11 and 12 in such a manner that the transmission signals do not flow in to a reception system.
  • a receiving unit 17 for performing an amplifying operation, a demodulating operation, and the like of reception signals is connected to this reception-side filter 15.
  • the antenna selector 13 is constituted by employing a switch "A" 21 which connects the antenna “A” 11 to the transmission system; a switch “B” 21 which connects the antenna “A” 11 to the reception system; a switch “C” 23 which connects the antenna “B” 12 to the transmission system; and a switch “D” 24 which connects the antenna “B” 12 to the reception system.
  • a switching control unit 19 is provided which performs switching control operations of connecting and disconnecting the switches 21, 22, 23, 24 of the antenna selector 13. The switching control operations of the switches 21 to 24 are carried out in response to a control signal supplied from the switching control unit 19.
  • As control signals for switching the antennas a transmission timing signal 31, a reception timing signal 32, a transmission antenna switching signal 33, and a reception antenna switching signal 34 are employed, which will be explained later.
  • a first description is made of both a transmitting operation and a receiving operation in the case that only the first antenna "A" 11 is used without performing a diversity operation.
  • a transmission signal outputted from the transmitting unit 16 is transmitted/outputted via the transmission-side filter 14, and the switch "A" 21 of the antenna selector 13 from the antenna "A" 11 to the base station (not shown).
  • the transmission signal is cut off by the reception-side filter 15, and thus, does not flow into the reception system.
  • a reception signal received by the antenna "A” 11 is entered via the switch "B” 22 of the antenna selector 13 and the reception-side filter 15 to the receiving unit 17, after interference waves are removed from this reception signal.
  • the reception signal is cut off by the transmission-side filter 14, and thus, does not flow into the transmission system.
  • Fig. 2 is a time chart for showing both the transmission timing and the reception timing when the voice communication operation is performed, and when the asymmetrical packet communication operation is carried out.
  • a single sub-frame is subdivided into three slots, while transmission slots "TX-0", “TX-1”, “TX-2” are provided whereas reception slots “RX-0", “RX-1 ", “RX-2” are provided.
  • both a down-stream transmitting operation and an up-stream receiving operation are carried out respectively in a continuous manner over all of the slots, and thus, transmitting/receiving operations are carried out at the same time in a parallel manner.
  • the voice conversation operation and the single packet communication operation are carried out in the mobile station terminal, as represented in Fig.
  • a transmitting operation and a reception operation are alternately carried out in a time divisional manner by employing one reception slot and one transmission slot (namely, "RX-0" and "TX-0" in shown example), which are allocated to the mobile station terminal.
  • the asymmetrical packet communication operation corresponds to such a packet communication operation that while plural sets of slots for transmitting data from the base station to the mobile station terminal along the up-stream direction can be used, a receiving operation is carried out by the mobile station terminal in the continuous manner in such a case that there are empty slots.
  • a receiving operation of the down-stream direction is carried out in a continuous manner by employing a plurality of slots (namely, all of "RX-0", “RX-1", and "RX-2" in shown example).
  • a transmitting operation of the up-stream direction is carried out in an intermittent manner by employing one transmission slot (namely, "TX-0" in shown example) which has been similarly allocated to the mobile station terminal in the case of the voice conversation operation. Since such an symmetrical communication operation is carried out, a data transfer rate along the down-stream direction can be increased approximately 3 times higher than that of the normal single packet communication operation executed in the TDMA system.
  • the communication operation is brought into simultaneous transmitting/receiving operations at such a timing that a transmission slot and a reception slot are overlapped with each other (namely, "TX-0" and “RX-2" in shown drawing).
  • both the switch "A" 21 and the switch “B” 22 of the antenna selector 13 are connected by the switching control unit 19 only during this time period.
  • both the transmission-side filter 14 and the reception-side filter 15 are connected to the antenna "A" 11 so as to constitute the antenna commonly-operable device, a single antenna "A” 11 is connected to both the transmission system and the reception system.
  • any one of the switch "A" 21 and the switch "B" 22 of the antenna selector 13 is connected in response to either the transmitting operation or the receiving operation, so that either the transmitting operation or the receiving operation is connected to the antenna "A" 11.
  • the transmission timing signal 31 and the reception timing signal 32 are employed as a control signal.
  • the transmission timing signal 31 corresponds to such a signal which is turned ON (for example, high level) at timing when a transmitting operation is carried out.
  • the reception timing signal 32 corresponds to such a signal which is turned ON (for example, high level) at timing when a receiving operation is carried out. Both the transmission system and the reception system can be independently connected to the antenna "A" 11 based upon the transmission timing signal 31 and the reception timing signal 32.
  • an antenna commonly-operable device for connecting both a transmission-side filter and a reception-side filter to an antenna is required.
  • the antenna commonly-operable device since a reception signal received from the antenna is equally distributed to both a transmission system and a reception system, a loss may be produced in the reception signal except that an input impedance of the transmission system completely becomes infinite with respect to a reception frequency.
  • any of the voice communication operation, the single packet communication operation, and the asymmetrical packet communication operation diversity operations can be independently carried out in both a transmitting operation and a receiving operation by combining the switches 21 to 24 of the antenna selector 13. For example, when the transmitting operation is carried out and when the receiving operation is carried out, such an antenna having a better transmission characteristic, or a better reception characteristic (namely, signal level is higher) is selected from these two antennas 11 and 12.
  • both the transmission antenna switching signal 33 and the reception antenna switching signal 34 are employed as a control signal.
  • the transmission antenna switching signal 33 corresponds to such a signal indicative of an antenna selection when a transmitting operation is carried out. For example, when the antenna "A" 11 is selected, the transmission antenna switching signal 33 becomes a high level, whereas when the antenna "B" 12 is selected, the transmission antenna switching signal 33 becomes a low level.
  • the reception antenna switching signal 34 corresponds to such a signal indicative of an antenna selection when a receiving operation is carried out. For example, when the antenna "A" 11 is selected, the reception antenna switching signal 34 becomes a high level, whereas when the antenna "B" 12 is selected, the reception antenna switching signal 34 becomes a low level.
  • Fig. 3 is an operation explanatory diagram for indicating connection combinations of the respective switches in the antenna selector in a table form.
  • combinations of turning ON/OFF of the switches 21 to 24 are represented in the case that one of these antennas is selected during the transmitting operation and the receiving operation.
  • the switch "A" 21 of the antenna selector 13 is turned ON; the switch "B” 22 thereof is turned OFF; the switched “C” 23 thereof is turned OFF; and the switch “D” 24 thereof is turned ON.
  • the transmission system is connected to the switch "A" 21, and the reception system is connected to the switch "B" 22.
  • the transmission system and the reception system are separated from each other even under simultaneous transmitting/receiving operations condition, the deterioration of the reception sensitivity and the deterioration of the transmission distortion characteristic can be continuously suppressed.
  • the proper antenna can be selected when the transmitting operation is carried out, and when the receiving operation is carried out, so that more suitable communication environments can be obtained.
  • both the transmission antenna switching signal 33 and the reception antenna switching signal 34 are combined with both the transmission timing signal 31 and the reception timing signal 32 so as to execute the antenna selection switching operation, the deterioration of the transmission/reception characteristic under not such a simultaneous transmitting/receiving condition can be prevented.
  • turning ON/OFF of the switches 21 to 24 are firstly set in response to an antenna selection made by the transmission antenna switching signal 33 and the reception antenna switching signal 34.
  • either the switch “B” 22 or the switch “D” 24 is turned ON to be connected, which have been selected only at the timing when the receiving operation is carried out in response to the reception timing signal 32, and either the switch “A” 11 or the switch “C” 23 is turned ON to be connected, which have been selected only at the timing when the transmitting operation is carried out in response to the transmission timing signal 31.
  • the selecting operation of the antenna "A” 11 and the antenna “B” 12 may be arbitrarily changed at any time when the transmitting operation is carried out, and when the receiving operation is carried out.
  • logic statuses of a plurality of control signals may be alternatively combined with each other so as to control the switches 21 to 24.
  • the two antennas can be independently selected to be connected.
  • the asymmetrical packet communication operation is carried out, while the transmission-side filter and the reception-side filter are connected by the antenna selector, the same antenna can be selected. Otherwise, while the transmission-side filter and the reception-side filter are not connected by the antenna selector, the two antennas can be independently selected to be connected. Also, since the two independent control signals such as the transmission antenna switching signal and the reception antenna switching signal are employed, the antenna diversity operation can be realized in both the transmitting operation and the receiving operation when the asymmetrical packet communication operation is performed.
  • the transmission-side filter and the reception-side filter are connected via the antenna selector so as to constitute the antenna commonly-operable device, whereas in the case that the simultaneous transmitting/receiving operations are not carried out, the transmission-side filter is cut off by the antenna selector, so that the loss can be reduced and the reception sensitivity can be improved.
  • the antennas can be independently selected so as to be connected during the transmitting operation and the receiving operation, the communication qualities by using the antenna diversity can be improved not only during the receiving operation, but also during the transmitting operation, more specifically, during the asymmetrical packet communication operation where the simultaneous transmitting/receiving operations are carried out.
  • the reception sensitivity can be improved when the simultaneous transmitting/receiving operations are not carried out.
  • one antenna can be independently selected from the plural antennas during the transmitting operation and the receiving operation, and thus, either the reception performance or the transmission performance by the diversity operation can be improved.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)
  • Transceivers (AREA)
EP03723182A 2002-05-09 2003-04-23 Dispositif de communication mobile Withdrawn EP1503521A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2002134300 2002-05-09
JP2002134300A JP2003332940A (ja) 2002-05-09 2002-05-09 移動体通信装置
PCT/JP2003/005207 WO2003096574A1 (fr) 2002-05-09 2003-04-23 Dispositif de communication mobile

Publications (1)

Publication Number Publication Date
EP1503521A1 true EP1503521A1 (fr) 2005-02-02

Family

ID=29416701

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03723182A Withdrawn EP1503521A1 (fr) 2002-05-09 2003-04-23 Dispositif de communication mobile

Country Status (6)

Country Link
US (1) US20050176382A1 (fr)
EP (1) EP1503521A1 (fr)
JP (1) JP2003332940A (fr)
CN (1) CN1663146A (fr)
AU (1) AU2003235108A1 (fr)
WO (1) WO2003096574A1 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US8660603B2 (en) 2006-03-31 2014-02-25 Epcos Ag Mobile radio module for multiband-multimode operation

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JP2005252825A (ja) * 2004-03-05 2005-09-15 Toyota Industries Corp ダイバーシティ制御方法および無線通信装置
WO2006132328A1 (fr) 2005-06-10 2006-12-14 Matsushita Electric Industrial Co., Ltd. Appareil de communication sans fil et méthode de communication sans fil
EP1990954B1 (fr) * 2006-03-02 2018-06-27 Panasonic Intellectual Property Management Co., Ltd. Dispositif de transmission, système de communication sans fil et procédé de transmission
BRPI0815297A2 (pt) * 2007-08-31 2015-02-03 Newtrax Technologies Inc Rede sem fios, nós de infraestruturas de rede sem fios, meio e método para reduzir o consumo de energia dos nós e método para aumentar a probabilidade de detecção de grupos de terminais móveis que se movem em redes sem fios
US8155063B2 (en) * 2008-04-28 2012-04-10 Apple Inc. Apparatus and methods for transmission and reception of data in multi-antenna systems
JP5578617B2 (ja) * 2010-10-18 2014-08-27 パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ 送信方法、送信装置、受信方法および受信装置
US9154608B2 (en) * 2012-05-09 2015-10-06 Facebook, Inc. Data exchange between antenna and modem of mobile device

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Publication number Priority date Publication date Assignee Title
US8660603B2 (en) 2006-03-31 2014-02-25 Epcos Ag Mobile radio module for multiband-multimode operation

Also Published As

Publication number Publication date
CN1663146A (zh) 2005-08-31
US20050176382A1 (en) 2005-08-11
WO2003096574A1 (fr) 2003-11-20
JP2003332940A (ja) 2003-11-21
AU2003235108A1 (en) 2003-11-11

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